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Boil shrimps and garlic in water, salted to taste. Remove shrimps from water as soon as they turn pink, and drain. Immerse shrimps in a bowl of icy water for a few minutes to stop the cooking process. Let them rest for a few minutes prior to peeling.

Place shrimps in a glass bowl with lemon juice, and cover with plastic. Refrigerate for a minimum of 30 minutes.